Superheater boiler



May 29, 1928. 7 1,671,114

w. KEENAN, JR

SUPERHE'A'IER BOILER Filed Oct. 29, 1924 Patented May 29, 192.

WALTER F. KEENAN, JR.,

'0]? PELHAM, NEW YORK, ASSIGNOR' TO FOSTER WHEELER CORPORATION, OF NEWYORK, N. Y., A CORPORATION OF NEW YORK.

surnnnna'rna BOILER.

Application filed October at, 1924. semi in. water.

The general object of the invention is to provide an improvedsuperheater boiler construction. More specifically, the object of theinvention is to combine superheating a provisions with a known type ofmarine typeboiler to provide an efficient superheater boiler of simpleand reliablesconstruction and characterized by its relatively small bulkand weight per unit of capacity, its W relatively low draft losses andthe manner 1n which the superheater provisions are incorporated in andmade part of the combustion chamber wall of the boiler furnace. I llhevarious features of novelty which t characterize my invention arepointed out with particularity in the claims annexed to'and forming apart of this specification; but for a better understanding of theinvention, its advantages and specific objects attained with it,reference should be had to the accompanying drawings and descriptivematter in which I have illustrated and described a preferred embodimentof the in vention.

Of the drawings: Fig. 1 is an elevation in section, the section beingtaken on the line 1-1 of Fig. 3; Fig. 2 is a partial section on the line2-2 of Fig. 1'; and

Fig. 3is a partial elevation of the boiler. 'Ihe boiler shown in thedrawing comprises two parallel water drums vB located at the same levelat the opposite sides of the combustion chamber A of the boiler furnace.35 At an upper level, and midway between and .sponding parallel to thewater drums B is a steam and water drum C. nected to the steam and waterdrum C by a corresponding bank of inclined tubes D. To simplify theillustration only the tubes D r at the opposite sides of each bank areshown in Fig. 1. The heating gases after passing through the banks ofwater tubes D, which may be bafiled in any usual manner, pass intoheating gas outlet spaces A" in the boiler housing from which they aredischarged by stack connections not illustrated. In so far as abovedescribed, the boiler il- Each water drum B is con-- lustrated containsnothing novel with me,

but on the-contrary is of a type well known and in extensive useparticularly for marine purposes.

- In accordance with the present invention, .each side wall of thecombustion'chamber beneath the corresponding water drum B incorporates,and as shown in efi'ect is formed by a radiant heat superheater.

Each superheater is composed of superheating elements E, and thesupports and heat insulation for the elements. 'Each element E is formedof two cast steel sections connected end to end at E. The elements E ofeach superheater are generally rectangular .in section and are arrangedone above an other to form a smooth wall at the correside of thecombustion chamber. Each element E is connected at one end by anoutwardly extending flexible tube E to a. vertical inlet header E, andat its other end is connected by a similar tube E to a vertical outletheader I Each superheater element section is rigidly connected adjacentthe-joint E to a portion ot the sperheater supportingframe work shown asa correspondlng vertical channel bar G at the outer side ofthe elements.The connecting provisions include a lu-g E welded or otherwise theelement section. Ad-

i'igidly secured to of the elejacent its free end each section ment isconnected to another portion of the superheater supporting frame work inthe form of another vertical channel bar G, the connection including acorresponding lug E welded OI'OthBIWlSG rigidly. connected to thesection.

In addition to the four channel bars G,

the supporting frame work for each super- I heater also comprises avertical metal plate H, top and bottom channel bars I, and verticalchannel bars K at the ends of the super-f heater secured betweentheplate H and an outer metal plate J, the parts of the frame work beingsuitably connected as by rivets or welding. A closed heat insulatingspace is thus provided between the plate J and the plate H. The inletand outlet headers F and F of each superheater are secured by clampingyokes F to bracket J secured to the'plate J Suitable heat insulatingmaterial L as Sil-o-cel'is packed in the space between .the elements Eand the plate As shown, superheater is sp the combustion chamber onledge portions N of the fire brick floor N of the combustion chamber.Advantageously,v the fire the lower element E or} each aced above thebottom of v brick floor N is mounted on a layer of heat Above theuppermost ele- -tageously placed one or two tiers of tire connectionsbetween the superheater element .lll

till

(Fill) lugs E and the corresponding supports G are slotted toaccommodate the thermal elongation and contraction of the elements whichare anchored. through the connect ing lugs 13 to the central supportsGr. For the same reason the holes in the plates H and d through whichthe tubes lil extend are advantageously elongated in a horizontaldirection, but these features of construe-- tion did not originate withme and term no part of the invention claimed herein.

The boiler proper may be supported 'in any usual or suitable manner andits weight and that of the upper portion A ot the boiler housing may becarried in whole. or in part on the supporting frame Work of thesuperheaters but preferably is sustained in whole or inlarge part by theend walls A of the boiler housing or by pedestals M at the ends of thelatter. The boiler turnace shown was designed tor oil firing but the useof the invention is obviously not dependout on the character ot thecombustion pro-- visions (not shown) which may be employed in or inconnection with the combustion chamber of the boiler.

lit will be apparent that the elements and supporting frame work of each'superheater form a separate and distinct portion of the combustionchamber wall and replace heavy refractory wall portions ot masonry whichwould otherwise have to be employed, so that the addition of thesuperheater to the otherwise old boiler in the manner described need notadd to the bulk or weight of the boiler. l urthermore the superheatersare advantageously located to secure a given superheating effect with arelatively small amount of superheatingsurtace and Without in any wiseimpeding the drat't through the boiler. The location of the superheatersat thebottom ot the boiler rather than at a higher level is especiallydesirable in the case of a marine boiler because of the resultantlowering in theheight ot the center gravity oil the boiler. use ofradiant heat superheaters inthe walls ot the coinbustion chamber otcompact boiler intended for operation at high ratings hire the marinetype ot boiler illustrated, is espe cially desirable because they permitthe use ot energetic and highly ellicicnt combustion conditions withoutinjurious effect on the combustion chamber walls. The super-heat era arenot only them-selves practically im mune from injury by overheating butthey cool and thereby protect the end walls A against overheating byabsorbing radiant heat from the latter. While in accordance with theprovisions of the statutes l have illustrated and described the bestterm of my invention now known to me, it will be apparent to thoseskilled in the art that changes in the term 0t apparatus specificallyillustrated and described herein may be made without depart ing from thespirit of my invention as set forth in the appended claims, and thatcertain features 0t my invention may some times be employed withadvantage without a corresponding use ot other teatures.

Having now described my invention whatit claim as new and desire tosecure by Letters Patent is:

l. The combination with a boiler comprising parallel water drums at thesides oil the turnace combustion chamber and water tubes connecting saiddrums to an upper steam and water drum of means for super heating thesteam generated in the boiler at approximately boiler pressureconsisting ot a radiant heat superheater located beneath each water drumand torming a corresponding portion of the wall of the combustionchamber.

2.111 a boiler furnace of the type compris ing a horizontal water drumat one side of the furnace combustion chamber and upwardly extendingwater tubes connected to the drum, the improved means for heating steamgenerated in the boiler at approirb mately boiler. pressure whichconsists in a radiant heat superheater located beneath said drum andcomprising horizontally disposed elements uniting to term .a heatabsorbing combustion chamber side wall and i a structural support torsaid elements at the outer sides of the latter,

3, ln a boiler furnace of the type comprising a horizontal water drum atone side of the furnace combustion chamber and upwardly extending watertubes connected to the drum, the improved means for heating steamgenerated in the boiler at approximately boiler pressure which consistsin a radiant heat superheater located beneath said drum and comprisinghorizontally dis posed elements uniting to term a smooth surfaceabsorbing heat from the combustion chamber a structural support for saidelements at the outer sides of the latter, and heat insulating materialsupported by said frame worlr betweenit and the elements and unitingwith said trams worlr andelements to term a unit section of thecombustion chamber wall.

Signed at New Yorlr city, in the county ct New York and State ot NewYorlr, this 27th day ot @ctober, A. l), l92l.

written It. KEENAN, din.

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